Geodesic
Localization of eigenvalues and estimation of the spread for complex matrices
Izvestiya. Mathematics , Tome 79 (2015) no. 1, pp. 208-215.

Voir la notice de l'article provenant de la source Math-Net.Ru

For a given complex matrix we describe new methods for localizing the eigenvalues and new upper bounds for the spread. These methods and upper bounds are sharper than those previously known.
Keywords: eigenvalues, localization, spread, upper bounds, new methods. 
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J. Wu; D. Wang; J. Zhao. Localization of eigenvalues and estimation of the spread for complex matrices. Izvestiya. Mathematics , Tome 79 (2015) no. 1, pp. 208-215. http://geodesic.mathdoc.fr/item/IM2_2015_79_1_a8/

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